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Mixing and Diluting Spray Concentrates

Posted in Garden Advice on November 07, 2014

How to Mix and Dilute Garden Chemicals 

It is perhaps because it seems so easy that some times, not enough care is taken and mistakes are made. Remember that concentrates are by their very nature more active than the final spray and are therefore to be handled with some respect. Here is a simple guide to diluting concentrates for spraying, safely, with minimum waste and best efficacy.

1. Protect yourself

Put on waterproof gloves and eye protection. We also advise wearing a face mask, overalls and gumboots or similar during mixing and spraying.

2. Prepare the product

Liquids - Shake product well before use and let any foam settle.
Powders/granules - Shake product gently to loosen and let settle for five minutes.

Most sprayers have measuring marks on the outside. If your sprayer does not, then using a 1 litre measuring jug, add 1 litre at a time to the sprayer and mark each level with an indelible marker.

Using a measuring jug and sprayer >

  • If possible use a 1 litre measuring jug dedicated to the type of product to be used i.e. garden insecticide/fungicide, selective weed killer, non-selective weed killer, household insecticide, moss and mildew killer, etc. Rinse out measuring jug and sprayer with clean water.
  • Quarter fill the measuring jug with clean water. Carefully add the required amount of concentrate or powder/granules to the water in the jug (if powder/granules- stir until dispersed).
  • With clean water rinse out the measuring cap/cylinder into the jug at least 5 times. Add clean water to the jug until the level reaches 1 Litre.
  • Add mixture to the sprayer. Using measuring jug, add more clean water to the sprayer until the required water level is achieved.
  • Using a jug is unlikely to cause foaming. If foaming occurs, slow the addition of water. Let liquid sit until foam subsides before completing filling. Do not let foam spill from the sprayer.

Sprayer only >

  •  Rinse sprayer with clean water.
  • Add 1 litre of clean water to the sprayer. Carefully add the required amount of concentrate or powder/granules to the water in the sprayer (if powder/granules- stir until dispersed).
  • Using clean water, rinse out the measuring cap/cylinder into the sprayer at least 5 times. Add clean water to the sprayer until the level reaches 5 Litres.

Note: If foaming occurs, slow the addition of water. Let liquid sit until foam subsides before completing filling. Do not let foam spill from the sprayer.

3. Clean sprayer, jug and stirrer

After use, rinse the sprayer, jug and stirrer out with clean water at least three times. It is good practice to pump clean water through the spray nozzle to clear product from sprayer head and tube.

If a diluent (solvent) other than water is used, the equipment should be cleaned with an appropriate cleaner such as household washing up liquid. It is also recommended that sprayer seals are checked and lubricated with petroleum gel, grease or similar to keep in good order.

Mixing with diluents (solvents) other than water

Some Kiwicare products are not formulated to mix with water e.g. NO Borer Total Wood Protection Concentrate. And some products can be mixed with other diluents for better effectiveness, e.g. NO Spiders Total Protection mixed with turpentine. In this case the process is similar to that described above but using the appropriate solvent.

Watch these videos presented by Kiwicare's David Brittain.

This table will help you get the best out of concentrates, stay safe, reduce spills and save you money.

Table of Dilution Rates

Liquid - Label Rate

Final Spray Volume 500ml 1 Litre 2 Litre 3 Litre 4 Litre 5 Litre 10 Litre 20 Litre
1ml per Litre 0.5ml 1.0ml 2.0ml 3.0ml 4.0ml 5.0ml 10.0ml 20.0ml
2ml per Litre 1.0ml 2.0ml 4.0ml 6.0ml 8.0ml 10.0ml 20.0ml 40.0ml
5ml per Litre 2.5ml 5.0ml 10.0ml 15.0ml 20.0ml 25.0ml 50.0ml 100ml
10ml per Litre 5.0ml 10.0ml 20.0ml 30.0ml 40.0ml 50.0ml 100ml 200ml
12.5 ml per Litre 6.5ml 12.5ml 25.0ml 37.5ml 50.0ml 62.5ml 125ml 250ml
25ml per Litre 12.5ml 25.0ml 50.0ml 75.0ml 100ml 125ml 250ml 500ml
35ml per Litre 17.5ml 35.0ml 70.0ml 105ml 140ml 175ml 350ml 700ml
50ml per Litre 25.0ml 50.0ml 100ml 150ml 200ml 250ml 500ml 1L
75ml per Litre 37.5ml 75.0ml 150ml 225ml 300ml 375ml 750ml 1.5L
100ml per Litre 50.0ml 100ml 200ml 300ml 400ml 500ml 1L 2L
4:1 ratio* 100ml 200ml 400ml 600ml 800ml 1L 2L 4L
5:1 ratio* 83.3ml 167ml 333ml 500ml 666ml 833ml 1.67L 3.33L
9:1 ratio* 50.0ml 100ml 200ml 300ml 400ml 500ml 1L 2L
20:1 ratio** 25.0ml 50.0ml 100ml 150ml 200ml 250ml 500ml 1L

Powder/Granule - Label Rate

Final Spray Volume 500ml 1 Litre 2 Litre 3 Litre 4 Litre 5 Litre 10 Litre 20 Litre
10g per 5 Litres 1.0g 2.0g 4.0g 6.0g 8.0g 10.0g 20g 40g
20g per 5 Litres 2.0g 4.0g 8.0g 12.0g 16.0g 20g 40g 80g
30g per 20 Litres
(15g per 10 Litres)
0.75g 1.5g 3.0g 4.5g 6.0g 7.5g 15g 30g
50g per 4 Litres 6.3g 12.5g 25g 37.5g 50g 62.5g 100g 20g

*Ratios - Some products specify a ratio of diluent (water or another solvent) to concentrate. In this case, add the two numbers together where the total will be the final volume. e.g. 4:1 ratio is 4 Litres water plus 1 Litre concentrate equals 5 Litres final solution.

**When the ratio becomes high, e.g. 20:1 or higher, it is reasonable, for the sake of ease of calculation, to add 1 part concentrate and make up to 20 parts final solution instead of trying to calculate 1/19th of the final volume or measure 21 parts. So the volumes of concentrate shown in the table above for 20:1 ratios are strictly speaking those for 19:1 ratio.

David Brittain
Kiwicare

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